HIGH-RESOLUTION INFRARED-SPECTRUM OF PROPYNE - THE 30-MU-M REGION

A high-resolution (0.002 cm-1) spectrum of propyne in the region of 30 μm has been used to improve the constants of ν10 and to analyze its hot bands. For ν10, it was found necessary to use ηJJ, ηJK, ηKK, and even ηKKK and ηKKKK constants to fit the high K series correctly. A standard deviation of 0.00021 cm-1 was obtained. The assignments were more challenging for the hot bands. Finally, more than 2000 transitions were assigned in the 2ν10±2-ν10+1 band and more than 1500 in 2ν100-ν10±1. The final fit, also including ν9, and microwave data will be presented in a future paper. © 1990.